Machine Conundrum

[Barack]

I am currently having a lot of trouble trying to decide what the attached sketchyphysics machine should do. I made it when i was bored at home. I've tried thinking up ideas for ages, but i can't find an idea. Maybe someone could help me decide on a use for it. It uses 2 spinning drums with arms, both with hinges on them, and one arm has a capsule attatched to a slider.

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The machine that is giving me a headache.